Though currently there is little scientific evidence to suggest that magnetic therapy is an effective treatement of any medical condition, yet one of your friends is wearing a magnetic bracelet for pain relief. What symptoms should warrant your friend to discontinue its use?
or
A coil of copper wire is connected to a galvanometer. What would happen if a bar magnet is : (i) pushed into the coil with north pole entering first (ii) pulled out of the coil (iii) held stationary inside the coil.

Explanation

(i) Mid dizziness due to increased circulation of oxygenated blood.
(ii) Quick development of arrhythmia (irregular heartbeat) in case your friend's heart is with an internal pacemaker.
(iii) Difficulty in controlling diabetes in caser your friend is using an internal insulin pump.